The word demarcating is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Plays In The Letters demarcating
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Seven Letter Word Alert: (66 words)
agatine, airdate, amentia, anaemic, animate, antacid, cairned, cantred, carding, carinae, carmine, carnage, cartage, carting, certain, crating, cringed, damager, darting, deraign, detrain, diagram, dragnet, gametic, garment, gateman, gradate, grained, grandma, granite, granted, grimace, ingrate, magenta, magnate, managed, manager, mandate, mangier, margate, martian, megarad, migrant, migrate, minaret, mintage, nametag, nematic, radiant, radiate, ragtime, raiment, reading, readmit, reaming, tanager, tangier, tangram, teaming, tearing, tiaraed, tracing, tradein, trading, trained, tranced